Handle target.bionic in bp2build.

Soong supports some hand-crafted target.<type> that match multiple os or
arch types to simplify configuring for similar targets. target.bionic is
used to match on both android and linux_bionic OSes for cases where they
should be handled the same way.

Test: build/bazel/ci/bp2build.sh
Change-Id: I47b6aaf3279e4d242c4fd0e12f24117eb98e0665

bazel/configurability.go

@@ -91,6 +91,11 @@ var (
 		conditionsDefault: ConditionsDefaultSelectKey, // The default condition of an os select map.
 	}
 
+	platformBionicMap = map[string]string{
+		"bionic":          "//build/bazel/platforms/os:bionic",
+		conditionsDefault: ConditionsDefaultSelectKey, // The default condition of an os select map.
+	}
+
 	platformOsArchMap = map[string]string{
 		osArchAndroidArm:        "//build/bazel/platforms/os_arch:android_arm",
 		osArchAndroidArm64:      "//build/bazel/platforms/os_arch:android_arm64",
@@ -117,6 +122,7 @@ const (
 	arch
 	os
 	osArch
+	bionic
 	productVariables
 )
 
@@ -126,6 +132,7 @@ func (ct configurationType) String() string {
 		arch:             "arch",
 		os:               "os",
 		osArch:           "arch_os",
+		bionic:           "bionic",
 		productVariables: "product_variables",
 	}[ct]
 }
@@ -148,6 +155,10 @@ func (ct configurationType) validateConfig(config string) {
 		if _, ok := platformOsArchMap[config]; !ok {
 			panic(fmt.Errorf("Unknown os+arch: %s", config))
 		}
+	case bionic:
+		if _, ok := platformBionicMap[config]; !ok {
+			panic(fmt.Errorf("Unknown for %s: %s", ct.String(), config))
+		}
 	case productVariables:
 		// do nothing
 	default:
@@ -167,6 +178,8 @@ func (ct configurationType) SelectKey(config string) string {
 		return platformOsMap[config]
 	case osArch:
 		return platformOsArchMap[config]
+	case bionic:
+		return platformBionicMap[config]
 	case productVariables:
 		if config == conditionsDefault {
 			return ConditionsDefaultSelectKey
@@ -186,6 +199,8 @@ var (
 	OsConfigurationAxis = ConfigurationAxis{configurationType: os}
 	// An axis for arch+os-specific configurations
 	OsArchConfigurationAxis = ConfigurationAxis{configurationType: osArch}
+	// An axis for bionic os-specific configurations
+	BionicConfigurationAxis = ConfigurationAxis{configurationType: bionic}
 )
 
 // ProductVariableConfigurationAxis returns an axis for the given product variable